Smoke preventer



y G. M. PHILLIPS ET AL 2,320,299

SMOKE PREVENTER Filed Sept. 6, 1941 2 Sheets-Sheet 1 ear 6/1/75/[7 .s M

deceased, 5y (S'MSflWZS/SIJZWH brd aamrx. INVEN TORS ATI'DRN EYS May 25, 194 G. M. PHILLIPS ET AL 2,320,299

SMOKE PREVENTER Filed Sept. 6, 1941 2 Sheets-Sheet 2 aajmww ATI'D RNEYS Patented May 25, 1943 y Rutherford, deceased, late of Louisville, Ky., by Susan B. Rutherford, administratrix, Louisville,

Application September 6, 1941, Serial No. 409,896

1 Claim.

The present invention relates to steam boilers, furnaces and the like and has among its objects and advantages the provision of an improved smoke preventer which operates in an eificient manner, is easily installed in conventional boiler and furnace devices, and in which the system operates noiselessly and automatically.

In the accompanying drawings:

Figure 1 is a front elevational view of a steam boiler illustrating the invention applied thereto;

Figure 2 is a perspective view of a valve operating line having a lost motion connection with a fire box door of the furnace;

Figure '3 is a top plan view of two steam jetting devices for deliveringsteam to the burning gases to prevent smoking, one of the which devices is illustrated in section;

Figure 4 is a side elevational view of a time control; and V Figure 5 is an end View of the device of Figure 4. In the embodiment selected for illustration, Figure 1 illustrates a steam boiler ill provided with the usual fire b'ox doors l2 pivotally connected with the boiler wall 14 through the medium of hingesiii. 'The usual ash pit doors 18 are also hingedly connected at 20 with the wall l4 but form no part of the present invention.

A steam supply pipe 22 connects with a cross branch pipe 24 through the medium of a T consection 25. in Figure 3, right angular pipe branches 28 are connected with the branch pipe through the medium of elbows 30 and to each branch pipe 28 is connected a hollow head 32,

each provided with a plurality of steam jets 34.

The branch pipes 28 lie in a horizontal plane and the heads 32 are positioned inside the combustion chambers. The jets 34 also lie in a horizontal plane and are arranged in diverging relationship on each head 32 so as to d rect steam jets horizontally in different directions throughout the widths of the respective combustion chambers.

Interposed in the steam supply pipe 22 is a butterfly valve 36 controlled through the medium of an arm 38 attached to a chain 48 passing thrcugh a time control device 42 and connected with one of the doors l2 and with the other door it? through the medium of a branch chain 44' Thegrcater portion of the cha n 4-6 extends horizontally across the outer face of the wall I4 and is passed around a swivel sheave 46, with the branch chain ii passing about a swivel sheave 48. The swivel sheaves 46 and 48 are secured to the wall Mi To the chain 40 is connected a branch chain 50 connected at 52 with an air intake door 54 pivoted to the wall 14 at 56. Branch chain 50 passes over a swivel sheave '53 and is provided with a weight 69. A weight 62 is also attached to one end of the chain 49 beneath a time control device 42.

When either of the doors I2 is opened, a pull is exerted on the chain 40 which elevates the weight 62. At the same time, the arm 38 is pivoted for opening the butterfly valve 36 to admit steam to the branch pipe 24 and the heads 32 for admission into the combustion chambers through the medium of the jets 34. Thus such admission of steam prevents smoking of theme while the fire box doors i2 are opened for furnace loading purposes. The time control device '42 retards downward movement of the weight 62 so as to gradually shut the butterfly valve 36 after the doors l2 have been closed. In opening either door l2, the weight is rendered free to open the valve 54, which weight is sufiiciently less than the weight 62 .to permit the latter to lift the weight 62 gradually with the closing of the butterfly valve 36. a

Referring to Figures 4 and 5, the time control device 42 comprises two spaced and parallel bars 64 and 66 held in spaced relationship by sleeves 68 mounted on bolts 10. A shaft 12 is rotatably journaled in the bars 64 and 66 and has a sprocket 14 fixedly keyed thereto, which sprocket is located outside the casing wall 16 which encloses the time control mechanism. Wall I6 is made secure between nuts 78 on the bolts 16, and the casing wall is secured to the wall I 4, as at 80.

The chain 46 passes over the sprocket wheel 14 and about a reversing pulley 82 mounted on ashaft 84 secured to the wall 16. To the shaft 12 is fixedly connected a large gear 86 meshing with a small pinion 88 keyed to a shaft 90 rotatably journaled in the bars 64 and 66. A brake wheel 92 iskeyed to the shaft 96 and is engaged by a brake shoe 94 carried by a bar 96 pivotally connected at its lower end with one spacing sleeve 68. An adjusting screw 98 is connected with the bar 96 at its upper end and is provided with an adjusting nut I00. Screw 98 extends loosely through one of the bolts 78 and the sleeve 68 mounted thereon, and the adjusting nut I00 engages that sleeve. Thus the brake shoe 94 may be adjusted for variable pressure with respect to the brake wheel 92. Accordingly, the descending movement of the weight 62 may be controlled for time through adjustment of the brake shoe 94 for variably retarding rotation of the wheel 92 which operatively connects with the sprocket I4 through the medium of the pinion 88, the gear 86 and the shaft 12.

In the event that the butterfly valve 36 should fail to operate in the manner intended, a by-pass pipe I02 is connected into the steam supply pipe 22. Globe valves I04 are interposed in the steam supply pipe 22 between the T connections I06 to which the by-pass pipe I02 is connected. A globe valve I08 is also inter-,

Figure 2 illustrates a bracket IIO secured to. This bracket is one of the fire box doors l2. provided with an opening II2 of sufficiently large diameter to permit the chain 40 to slide freely therein. 1T0 the lower end of the chain 40 is connected a weight H4. This weight is positioned a short distance beneath the bracket H in the closed position of the furnace door, so that the chain 40 has a lost motion connection with the door. The lost motion connection permits the door to be swung some distance before the bracket engages the weight H4 to the end that proper movement may be imparted to the valve arm 38. The other furnace door connected with the branch chain 44 is also provided with a bracket H0, and a weight H4 is also connected with the branch chain. The combined load of the two weights I I4 and the weight 60 is less than theweight'62 so that the latter may move the valve 36 to its closed position at a rate determinedby the time control device. The valve 36 in its closed position limits further downward movement of the weight 62. y

The present invention operates. efficiently with respect to the delivery of steam to the combustion chambers, the steam jets being directed in a horizontal plane in such diverging relationships as to effectively distribute the steam throughout the combustion chambers. Mere opening of either or both the fire box doors opens the butterfly valve 36 for admitting steam to the jets, and the time control device 42 retards closing of the valve 36 for the desirable length of time, which time period may be varied through mere adjustment of the nut I00. In addition, the system operates noiselessly.

7 Without further elaboration, the foregoing will so fully illustrate the invention, that others may,

by applying current knowledge, readily adapt the same for use under various conditions of: service.

What is claimed is:

In a furnace, steam jet means located in the combustion chamber of the furnace, a steam pipe for supplying steam to said jet means, a normally closed valve in said steam supply pipe for controlling the admission of steam to said jet means, a time control device, a flexible pull line operatively connected with said time control device and having a weight attached thereto beneath said time control device, a bracket fixed to each of the fire box doors of the furnace, said brackets having openings, one end of said pull line extending through the opening of one of said brackets and being provided with weight located below the bracket, a branch pull line connected with said first pull line and ex tending through the opening of the other of said brackets and provided with a Weight located below the bracket, said brackets-establishing lost motion connections between said fire box doors and said first and branch pull lines, and an operating connection between said first. pull line and said valve to open the valve when either ,or both of the fire box doors are open, said time control device retarding movement of said first pull line by said first Weight after the closing of the firebox doors.

GEORGE M. PHILLIPS,

, v SUSAN B. RUTHERFORD, Administratrix of the Estate of William P. Rutherford, Deceased. 

